**Core Concept**
Wolf-Parkinson-White (WPW) syndrome is a rare genetic disorder characterized by the presence of an accessory electrical pathway in the heart, known as the accessory atrioventricular (AV) pathway or bypass tract. This extra pathway can cause the heart to beat too quickly, leading to symptoms such as palpitations, shortness of breath, and fainting.

**Why the Correct Answer is Right**
The correct answer is related to the characteristic electrocardiographic (ECG) findings of WPW syndrome. The typical ECG features include a short PR interval (<120 ms), a wide QRS complex, and a delta wave (slurred upstroke) in the QRS complex. The accessory pathway can conduct electrical signals from the atria to the ventricles, bypassing the normal AV node pathway. **Why Each Wrong Option is Incorrect** * **Option A:** This option might be incorrect because WPW syndrome is not typically associated with a prolonged QT interval. WPW syndrome is characterized by a short PR interval and a wide QRS complex, but not a prolonged QT interval. * **Option B:** This option might be incorrect because WPW syndrome can cause a rapid heart rate, but it is not typically associated with a slow heart rate. WPW syndrome is characterized by a short PR interval and a wide QRS complex, which can lead to a rapid heart rate. * **Option C:** This option might be incorrect because WPW syndrome is not typically associated with a normal ECG without any abnormalities. WPW syndrome is characterized by a short PR interval, a wide QRS complex, and a delta wave. **Clinical Pearl / High-Yield Fact** WPW syndrome can be life-threatening if not treated, as it can cause a rapid heart rate that can lead to cardiac arrest. The treatment of choice for WPW syndrome is radiofrequency ablation, which involves using energy to destroy the accessory pathway and restore a normal heart rhythm. **Correct Answer: D.**